Electromagnetic device.



E. B. CRAFT.

ELECTROMAGNETIC DEVICE,

APPLICATXON FILED MAR. I7. 1919.

1,1 39,956. Patented May 18, 1915.

2 SHEETSSHEET 1.

W/fnesses: //7\/e mar: v

3 b LBCra/fi M wMMM W 2 SHEETS-SHEET 2- Patented Mag/18, 1915.

E. B. cam. ELECTROMAGNETIC DEVICE.

F/qfi.

APPLICATION FILED MAR. I7, 1910.

//7ve/7/0/' f. 5. (Ira/f. y

Hqesses W UNITED STATES PATENT omen.

EDWARD IB. CRAFT, OF HACKENSACK, NEW JERSEY, ASSIGNOR TO WESTERN ELECTRIC COMPANY, OF NEW YORK, N. Y., A CORPORATION OF ILLINOIS.

ELECTROMAGNETIC DEVICE. I

Specification of Letters Patent.

Application filed March 17, 1910. Serial No. 549,954.

To all whom it may concern:

Be it known that I, EDWARD B. CRAFT, a citizen of the United States, residing at Hackensack, in the county of Bergen and State of New Jersey, have invented a certain new and useful Improvement in Electromagnetic Devices, of which the following is a full, clear, concise, and exact description.

This invention relates to electromagnetic switching devices and more particularly to an electromagnetic switching device embracing two or more independently operable electromagnets, one of which is adapted to operate the switching parts, the other of which controls locking means for retaining said switching parts in operated position.

One of the features of this invention relates to the novel arrangement of the two electromagnets whereby they may be assembled into a compact structure with their magnetic fields so related that the energization of one magnet will not exert sufficient magnetizing effect upon the armature of the other to cause the operation thereof. This feature is attained by so hinging and locating the armatures of the two magnets that they are severally responsive to magnetic lines of force flowing in paths at right angles to each other; one of said magnets lying in a line joining points of equal magnetic potential of the other and having its field limited to, a zone and direction which will offer insuflicient attraction to the armature of the other to cause its operation.

Other features of this invention relate to the arrangement and operation of the switching elements, the controlling of the operating circuits of theelectromagnets and details of construction which will be more particularly described with reference to the accompanying drawings in which Figure 1 is a plan view of a relay em bodying my invention; Fig. 2 is a side view partly in section. Fig. 3 is a front view;

Fig. 4 is a vertical sectional view on the line 44 of Fig. 2; Fig. 5 is a rear view; and Fig. 6 is a vertical sectional View on the line 66 of Fig. 1.

Like characters of reference are used to designate like parts throughout the several "leWS.

Referring to the drawings, 12 is a base provided with supports 13 and'14 to which a yoke 15 may be secured byscrews. Secured to the yoke 15 are coils 16 and 17 which, together with their armature 18, are referred to herein as the operating electromagnet. The armature 18 is carried by a member 19 pivotally mounted upon the base 12 in some suitable manner, as for example, by means of screws 20 and 21 passing through arms 22 and 23 of said member.

A second electromagnet, referred to herein as the releasing electromagnet, may comprise a coil 24 carried between the coils 16 and 17 by the yoke 15, a pole piece 25 and an armature 26. The said pole piece 25 may extend to the base as shown in Fig. 6 and serve both as a spool head and as a support for one end of the coil. The armature 26 may be carried by a spring 27 secured to the yoke 15. A spring 28 secured to the armature 26 serves as a restoring means therefor. The armature 26 may be provided with a catch 29 adapted to be engaged by a corresponding member 30 carried by the armature 18 whereby when the latter is operated it will be held in its operated position subject to release by the armature 26.

vA stop screw 106 passing through an extension 31 from the base serves as a means for regulating the range of movement of the armature 18.

The above structure, although manifestly complete in itself as an electromagnet suitable for various applications to the art, is particularly applicable-to relays or electromagnetic switches and is herein shown associated with three sets of contact springs or switches, the 'said sets being preferably carried in separate groups by brackets 32, 33 and 34. The group carried by bracket 32 comprises two main springs 35 and 36 having bent or flared extended ends 37 and 38, said springs being normally in electrical connection through the medium of springs 39, 40, 41 and 42 carried thereby. Two springs 43 and 44 are adapted to be engaged by springs 35 and 36 upon their deflection by the radially disposed rollers 45 d 46 carried by the member 19. It will e observedthat springs 35 and 36 are normally in electrical connection at two points, namely through the contact of springs 39 and 40 and also through springs 41 and 42, the arrangement being such that when springs 35 and 36 are deflected they make contact with springs 44 and 43 respectively before they are themselves electrically separated. This is provided for by having the ends of the springs 39 and 40 located in the path of the ends of the springs l1 and 42 and so adjusted that the former are not separated prior to the engagement of springs 35 and 3G with the outer springs. The groin) of springs carried by bracket 34, designated as 47, 48, 49, 50, 51, 52, 53, 54, 5 and 56 and controlled by rollers 57 and 58, 1nay be identical in structure with those carried by bracket 32 as shown.

The group of springs carried by the bracket 33 may comprise a spring 59 having a bent or flared extension 60 adapted to be engaged by roller 61 and two associate springs 62 and 63, the former of whlch is normally in contact with said spring 59 and the latter of which is normally out of engagement therewith. Spring 62, which is adapted to follow spring 59 when the latter is deflected, is provided with a lip 64 which is normally out of line with an insulating stud 65 carried by armature 26 of the release magnet. When, however, the operating magnet is energized, thereby attracting .the armature 18, the spring 59 is deflected and with it the following spring 62, thereby bringing the lip 64 into line with stud 65,

the result being that when the locking member 30 reaches the catch 29 and allows the armature 26 to rise the stud 65 acts upon the lip 64 to deflect spring 62 laterally whereby springs 59 and 62 are separated. It will be observed, however, that this separation does not occur until after the looking members have begun to engage The springs may be provided as shown wlth terminals 66, adapted for connection with con- .ductors.

The operation of the .device described above is as follows: With the mechanism in its normal condition as shown inthe drawings, the energization of the operating magnet comprising coils 16 and 17 will cause the armature 18 to be attracted whereby the rollers 45, 4 6, 57,58 and 61 will engage the corresponding switch springs, one result being the separation of the main springs of each outer group and their respective movement into contact with the springs associated therewith. Referring tothe middle group of switch springs the energization of the operating magnet results in the deflection of the spring 59 and also the following spring 62, namely in the shifting of the switch springs 59 and 62 from one position to another in which shifted position spring 59 engages with spring 63 but remains in contact with spring 62 until the member 30 carried by the armature of the operating magnet reaches the catch 29 and begins to engage therewith. At this juncture the armature 26 of the release magnet rises, forcing the stud 65 into engagement with the lip 64: whereby spring 62 is deflected from engagement with spring 59. It will be readily understood that the electromagnetic circuit of the release magnet will not be disturbed by the energization of the operating magnet by virtue of its position with respect thereto, whereby it lies in a line joining points of the latters magnetic circuit which are at substantially equal magnetic potentials. Since the separation of springs 59 and 62 occurs after the engagement-of member 30 with catch 29 has begun, said springs may be employed to open the circuit of the operating electromagnet and thus prevent useless current consumption. The circuit of the release magnet may be controlled in part by the contact of spring 59 with spring 63, said contact preferably operating merely to prepare said circuit for completion at another point. The energization of the releasing electromagnet will clearly operate to release the armature and by virtue of its relation to the operating electromagnet will produce insufficient magnetizing effect upon the armature of said operating electromagnet to retain it in its attracted position.

What is claimed is,

1. An electromagnetic device comprising substantially parallel cores, means for magmovement in a plane substantially at right angles to the plane defined by the axes of the first named cores.

2. An electromagnetic device comprising substantially parallel cores, means for sup porting and magnetically connecting one end of said cores, a coil on at least one of said cores, an armature, means for mounting said armature for movement toward and away'from the free end of said cores, a third core and coil therefor between the first named cores, a second armature lying substantially parallel to the third core, and means for mounting said armature for movement toward-and away from said third core in a plane substantially at right angles to the plane defined by the axes of the first named cores.

3. An electromagnetic device comprising substantially parallel cores, a yoke supporting and magnetically connecting one end of said cores, a coil on each of said cores, an armature, means for mounting said armature for movement toward and awayfrom the freeend of said cores, a third core between the first named cores secured at one end to said yoke, a coil for said third core, a second armature flexibly supported by said yoke and lying substantially parallel to said third core and adapted for movement toward and away from said third core in a plane substantially at right angles to the plane defined. by the axes o the first named cores. 7

4. In an electromagnetic device, the combination with an operating magnet, of an armature therefor, a release magnet, an armature for said release magnet, means controlled by therelease magnet for holding the armature of the operating magnet in itsactuated position, and switch springs successively actuated by the armatures of said magnets upon the energization of said operating magnet.

5. In an electromagnetic device, the combination with an operating magnet, of an armature therefor provided with a holding member, a release magnet, an armature for said release magnet provided with a catch adapted to engage said holding member, and a switch actuated subsequently to the engagement of said catch and holding member by the joint operation of said armatures.

(3. In an electromagnetic device, the combination with an operating magnet, of an armature therefor, a release magnet, an armature for said release magnet, a switch opened by said operating magnet armature, and a switch actuated by said armature jointly, the energization of said operating magnet controlling the operation of said armatures.

adapted to be engaged by said stud and means controlled by said operating magnet armature for moving said springs into position for the engagement of said stud and switch spring.

9. In an electromagnetic device, the combination with an electromagnet, of an armature, and a switch comprising two members in contact at two points and two members adjacent thereto with which the first said members engage prior to their complete separation.

In witness whereof, I, hereunto subscribe my name this 16th day of March A. D., 1910.

EDWARD B. CRAFT.

Witnesses:

IRVING MACDONALD MORGAN WAsnBURN, Jr. 

